An alert was sounded at the Ghaziabad-based airbase after unidentified men were reportedly spotted near the station on Thursday night.

[Representational Image] An Indian Air Force (IAF) jet has crashed during take off at the Kalaikunda Air Force Station located in Kharagpur in West Bengal. Picture: Indian Air Force (IAF) surface to air missiles are displayed, as an IAF IL-76 aircraft configured with the new AWACS (Airborne Warning and Control Systems) prepares to land, during a full-dress rehearsal for Indian Air Force Day celebrations at the Hindon air force station on the outskirts of New Delhi October 6, 2009.Reuters

The alert at the Hindon airbase led to the temporary closure of two Kendriya Vidyalaya schools on the premises as a precautionary measure, the Hindustan Times reported. One of the men who tried to enter the airbase has been detained, the daily said.

Earlier this week, the three terror suspects who were arrested by the Delhi police from in and around the national capital had reportedly revealed a plot to launch an attack at the Hindon air force base, just like JeM terrorists had done at the Pathankot airbase in January. The terror cell had also planned attacks on malls in Delhi.